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Related Experiment Video

Updated: Aug 19, 2025

Empirical, Metagenomic, and Computational Techniques Illuminate the Mechanisms by which Fungicides Compromise Bee Health

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Honey bee introductions displace native bees and decrease pollination of a native wildflower.

Maureen L Page¹, Neal M Williams¹

¹Department of Entomology and Nematology, University of California, Davis, California, USA.

|December 2, 2022

Summary

This summary is machine-generated.

Introduced honey bees (Apis mellifera) negatively impact native plant pollination by reducing resources and excluding native bees. Their own visits are ineffective, potentially harming plant reproduction and mutualisms.

Keywords:

competition conservation honey bee invasive species mutualism native bee pollen deposition pollination single visit effectiveness wild pollinators

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Collection and Identification of Pollen from Honey Bee Colonies

Collection and Identification of Pollen from Honey Bee Colonies

Published on: January 19, 2021

Area of Science:

Ecology
Pollination Biology
Conservation Biology

Background:

Introduced species can cause cascading ecological effects, often through indirect interactions.
Managed honey bees (Apis mellifera) are dominant floral visitors, impacting native bee communities via competition.
The indirect effects of honey bees on plant reproduction through pollination are poorly understood.

Purpose of the Study:

To investigate the direct and indirect impacts of honey bee abundance on the pollination of Camassia quamash.
To differentiate between the direct pollination effects of honey bees and their indirect effects via competition.

Main Methods:

Experimental honey bee hive additions and field observations over multiple years.
Pollination effectiveness trials (single-visit and multiple-visit) for honey bees and native bees.
Quantification of nectar and pollen availability and plant reproductive success (seed production).

Main Results:

Honey bee introductions indirectly decreased pollination by reducing nectar and pollen availability.
Honey bees competitively excluded more effective native bee pollinators.
Direct honey bee visits had negligible, potentially negative, impacts on pollination and seed production, as they are ineffective pollinators.

Conclusions:

Introduced honey bees can erode plant-pollinator mutualisms and negatively affect plant reproduction through indirect competition.
Understanding indirect effects of species introductions is crucial for conservation.
Careful management and coordination of honey bee hive placements are necessary to mitigate negative impacts.